No abstract

®), and topography (Medmont E300 ®) in children. Methods: A retrospective study was performed in 316 eyes of 160 subjects. Subjects were divided into 3 groups according to age. Group 1 was younger than 10 years, group 2 was older than 10 years and younger than 18 years, and group 3 was older than 18 years. Subjects were tested using the Lenstar LS900 ® , KR-8100 ® , and Medmont E300 ®. Comparisons were made for steep K, flat K, mean K, and astigmatism among three groups. Agreement among the 3 devices was examined using the Bland-Altman method. Results: The keratometry measured by Medmont E300 ® was highest, followed by that of Lenstar LS900 ® and KR-8100 ® in all 3 groups. Almost all keratometry was significantly different among the 3 devices except for the flat K measured by LS900 ® and KR-8100 ® in all 3 groups and flat K measured by KR-8100 ® and Medmont E300 ® in Group 3 (p < 0.05). With regard to mean K, the agreement between Lenstar LS900 ® and KR-8100 ® was better than that between the other two pairs in both Groups 1 and 2, while agreement between Lenstar LS900 ® and Medmont E300 ® was better in Group 3. The agreement between KR-8100 ® and Medmont E300 ® was worse than that between the other two pairs in Groups 1 and 3, while the agreement between Lenstar LS900 ® and Medmont E300 ® was worse in Group 2. Conclusions: There were significant differences in keratometry among the 3 devices in all 3 groups. In children, Medmont E300 ® showed relatively less agreement compared with the other two devices. In adults, however, the agreement between 2 devices showed variable results. Consideration of the keratometry measurement from Lenstar LS900 ® , KR-8100 ® , and Medmont E300 ® might be helpful to estimate accurate corneal keratometry in children.

Purpose: To compare the accuracy and clinical usefulness of different devices by measuring anterior chamber depth (ACD) with three devices and central corneal thickness (CCT) with four devices. Methods: In 180 eyes of 90 healthy subjects, ACD was measured using A-scan, Lenstar LS900 ® , Pentacam ® , and CCT was measured using ultrasound pachymetry (USP), Lenstar LS900 ® , Pentacam ® , and anterior segment optical coherence tomography (OCT). Results: The average ACT measurements using Lenstar LS900 ® , A-scan, and Pentacam ® were 3.27 ± 0.35 mm, 3.26 ± 0.36 mm, and 3.25 ± 0.36 mm, respectively. The measurements were significantly correlated (p < 0.001) but without statistically significant difference (p = 0.017). The Bland-Altman plots showed a low degree of agreement. The average CCT measurements us